Bump js-yaml from 3.13.1 to 4.1.0

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.13.1 to 4.1.0.
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](nodeca/js-yaml@3.13.1...4.1.0)

---
updated-dependencies:
- dependency-name: js-yaml
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -36,7 +36,7 @@
     "geit": "0.0.7",
     "he": "^1.1.1",
     "helmet": "^3.21.1",
-    "js-yaml": "^3.13.1",
+    "js-yaml": "^4.1.0",
     "lodash": "^4.17.21",
     "luxon": "^2.5.2",
     "memory-cache": "^0.2.0",